Silica gel
Silica gel Silica gel is an amorphous and porous form of silicon dioxide (silica), consisting of an irregular tridimensional framework of alternating silicon and oxygen atoms with nanometer-scale voids and pores.it looks like irregular crystal like beads. Since their microporous makeup has cavities that are interlocking, the gel has an extremely high area of surface, it makes for a perfect desiccant of high capacity.
Types of silica gel Silica Gel blue: Silica Gel on transfusion with Cobalt Chloride changes
to Silica Gel blue in dry condition , but when becomes hydrated , it changes to Silica Gel Pink. It absorbs 5% of moisture and shows color variation depending on the absorption of moisture, i.e from blue to purple and to light red. Therefore, it is used as a desiccant in avoiding humidity damage. Silica gel Blue is also used as a Transformer breather as well as in Chemical Industries.
Silica Gel Orange: Silica Gel blue was found to be hazardous and is presently replaced with Silica Gel Orange, with an alternative indicator methyl violet. In dry condition, Silica Gel orange remains in orange color, whereas changes its color to green when hydrated. It absorbs up to 2% of moisture and shows color variation depending on the absorption of moisture, i.e from light brown yellow to light brown green and then to blackish green. Therefore, it is used in the field of medicines, leather, and electrical appliances. Silica Gel orange is also used in Refrigeration and purification of power and air.
Silica Gel white: When Silica Gel is not transfused with and indicating
agents, it exists in Silica Gel white form, which has an absorption of 5% of moisture and shows color variation depending on the absorption of moisture, i.e from white to semi transparent and then to non transparent. Therefore, it is used as a catalyst carrier, rust inhibitor and also as gas drier. Silica gel white is also used in Power industries as well as for drying of flowers and seeds.
Applications of silica gel Agriculture
Pharma
Polymer Cosmatics
Advantages of Silica Gel as a Desiccant • Non-flammable • Reused by regenerating–heating the gel will stave off absorptions • Can absorb up to 40% of its own weight • Shelf life is indefinite–if stored airtight • It is inert and will not corrode or disrupt materials
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